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Test your basic knowledge |
Dairy Cattle And Reproduction
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Subjects
:
industries
,
dairy
Instructions:
Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.
This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. Supply nutrients for the sperm following ejaculation and deposition into the female reproductive tract
vagina
cow estrus
eminal vesicles
ewe estrus
2. % of fat in milk. makes cheeses and ice cream. regulates cost of milk
effects of BST
butterfat
testosterone
mare ovulation
3. 16-20 hours
cow estrus
effects of estrogen
testosterone
femininity of a heifer
4. Not being bred back into herd. horses are seasonal breeders vs. cows as anytime breeders
burdizzo
Mares
sigmoid flexure
functions of progestrone
5. Castration tool which clamps down on the vans deferens. causes the sperm to not reach the penis to be ejaculated
penis proper
vulva
burdizzo
Avg. bull specs
6. Prevent the cow from getting an infection from the calve
mare ovulation
organs used in spermatogenesis
Dairy calves are removed from cow at birth to...
age and castration
7. ~60 days before calving
monorchid
dry-off time in dairy cattle
spermatogenesis
cow estrus cycle
8. 336 days
functions of progestrone
rectal palpation (BSE)
mare gestation
femininity of a heifer
9. Largest dairy cow - largest udder - highly vascular - eat 40-50% dry matter (eat alot) - most total butterfat
cremaster muscle
cryptorchid
Holstein Cow
castration
10. 1. bring in new genes - 2. replace males with leg problems (difficulty breeding) Note: culling has a much greater emphasis in the dairy industry vs the beef industry.
mare estrus cycle
ewe ovulation
cow gestation
Culls bulls earlier (2 reasons)
11. Can produce 200 calves naturally (~100 bulls) - top 1-2% will grade like him. everything left to chance if no AI performed
Avg. bull specs
4 major reasons for culling dairy cows
vagina
penis sizes vs delivering methods
12. 1. brain function - 2. blood flow - 3. willing female
monorchid
Parturition
what has to happen for males for copulation to occur
spermatogenesis
13. 19-23 (21) days
Where livelihood is in agriculture
sow estrus cycle
polyestrous
cow estrus cycle
14. 1-3 days
ewe's estrous cycle
sertoli cells
sow estrus
dairy cattle pregnancy check
15. Check feet and legs - look for masculine traits in build such as crest and muscling
Lutinizing Hormone in males
visual evaluation (BSE)
organs used in spermatogenesis
spermatogenesis
16. 147 days
Sperm survival specs
Lutinizing Hormone in males
ewe gestation
ewe estrus cycle
17. Small tubes located at the upper ends of the uterine horns. connects uterine horn to infundibulum. passageway of the egg.
ewe's estrous cycle
Jersey Cow
cow estrus
oviducts
18. Parturition is controlled by...
retractor muscles
#1 cost in production
Avg. bull specs
Hormones from both the fetus and the mom.
19. 283 days
prostaglandin
prostate gland
4 major reasons for culling dairy cows
cow gestation
20. Head - neck - mid-piece - tail. genetic material - has an enzyme covering that allows it to penetrate the egg
cow gestation
sperm cell
monorchid
Lutinizing Hormone in males
21. Animals which have many estrous periods during certain periods per year (ex: mare - ewe)
seasonally polyestrous
scrotum
effects of estrogen
Testicles will produce testosterone but not sperm. Bull will attempt to mate - but will be sterile
22. Allows extension of penis without fibro-elastic penis
sigmoid flexure
growth lost from castration methods (knife & band)
scrotum
rectal palpation (BSE)
23. (from Jersey Islands in Great Britain) Smallest cow - least milk - highest butterfat %
purpose of Breeding Soundness Exam (BSE) for males
Jersey Cow
estrus
sigmoid flexure
24. Luteolysis happens because of the ____________ hormone
colostrum
Mares
cow estrus
prostaglandin
25. 26 hours after estrus begins
reasons for castration
functions of progestrone
ewe ovulation
Brown Swiss Cow
26. Examine accessory glands - also to know how big the pelvic opening is->heritable->relates to how much dystocia that bull's daughter has
Sperm survival specs
rectal palpation (BSE)
castration
Testicles will produce testosterone but not sperm. Bull will attempt to mate - but will be sterile
27. Animals which have only one estrous cycle (ex: dog - fox)
monestrous
polyestrous
Culls bulls earlier (2 reasons)
mastitis
28. Male on one pin and female on other side
sperm cell
burdizzo
mare gestation
libido test (BSE)
29. Sperm is produced here
burdizzo
seminiferous tubules
vagina
uterus
30. So when offspring are born - there is more food to be found for energy stores and fat deposits IN THE SPRING
prostaglandin
reason for seasonal breeding periods
spermatogenesis
sperm cell
31. Pulls sperm and egg together - gets body ready for pregnany - stimulates growth cells - develops mammary glands - starts to deposit fat.
Holstein Cow
libido test (BSE)
effects of estrogen
Follical Stimulating in females
32. ~305 days (altough often longer due to breeding difficulties)
Testicles will produce testosterone but not sperm. Bull will attempt to mate - but will be sterile
Dairy Cattle Lactation (standard)
Bull's fibro-elastic penis
functions of progestrone
33. (FSH) causes egg to mature in females
mare gestation
mare's estrous cycle
cow estrus cycle
Follical Stimulating in females
34. 30-38 hours after estrus cycle begins
sow ovulation
Dairy Cattle Gestation
vagina
ewe estrus cycle
35. 19-23 (21) days
sow estrus cycle
Bull's fibro-elastic penis
cow gestation
elastrator
36. Reproduction. more offspring leads to more feed costs - but is offset by reproduction numbers
Where livelihood is in agriculture
Lutinizing Hormone in males
cervix
Blood
37. Serves as a bone cradle for the reproductive system. used greatly in palpation as a 'landmark'.
effects of BST
Hormones from both the fetus and the mom.
pelvis
mare ovulation
38. Failure to have one testis (gonad) to descend
monorchid
behavioral signs of estrus
leydid or interstitial cells
Follical Stimulating in females
39. Indicator of sperm production. the bigger the scrotal circumference the bigger volume of sperm because more seminal vesicles available to produce the sperm
Lutinizing Hormone in males
scrotal circumference (BSE)
sow estrus cycle
why does the cow need fat deposits during pregnancy?
40. 16-20 hours
Hormones from both the fetus and the mom.
cow estrus
sigmoid flexure
monorchid
41. BST given to dairy cattle makes the mammary gland more persistent - helps produce more milk. good as Long-term because it does not cause cow to bulk up - provides more milk/cow Which means less cows needed - less cows need to be given feed - lower co
cryptorchid
seasonally polyestrous
effects of BST
scrotal circumference (BSE)
42. Milk made by mother which includes antibodies for the calf. MUST be given to the calf within the first 24 hrs of life. also provides calf with energy stores. effectiveness lasts from 4-8 months of age.
Sperm survival specs
~1 month
colostrum
monestrous
43. When are dairy cattle dehorned?
behavioral signs of estrus
~1 month
mare's estrous cycle
things to check for in a breeding soundness exam (BSE)
44. S-shaped inside body - relaxes to be exposed for breeding. Disadvantges: muscles weaken with age - cannot always hold it in - exposed to harsh outside conditions or stepped on.
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45. 45-60 days after breeding; re-breed as required
dairy cattle pregnancy check
sow ovulation
mare's estrous cycle
sow estrus
46. Scar tissue plugs up chambers of udder
you want as much sperm as possible to come in contact with the egg before ovulation. the main idea is to have the sperm already in the oviduct when the egg passes through
visual evaluation (BSE)
sigmoid flexure
mastitis
47. Help to signal hormone levels which we need both in the brain right next to each other.
Where livelihood is in agriculture
Grading choice
cow gestation
hypothalamus and pituitary gland
48. 1. to eliminate breeding the females at an early age - 2. makes animals less lean and provides a better cut for the market
ewe gestation
monorchid
functions of progestrone
reasons for castration
49. 45-60 days after breeding; re-breed as required
Jersey Cow
dairy cattle pregnancy check
sperm cell
hormones
50. Located directly in front of the cervix. fertilized egg implants here. connected to two uterine horns. implantation occurs on the same side as ovulation occurred.
uterus
hypothalamus and pituitary gland
retractor muscles
cow estrus
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